Minky is a polyester fabric like polar fleece. Also, if you've ever cut Minky, you know that it "sheds" when you cut it. I used it to back a baby quilt, and the stuff was all over the place just trying to square up the two ends and cut off the selvages. I swore that if I ever used it again, I'd do all the cutting outside. So if you do decide to cut it into blocks, be ready for a mess.